feat(kwayland): enable the auto-rotation and tablet mode

Summary:
Related kwin_wayland patches have been landed for rotation, so enable
the relevant features.

Depends on: D26036

Test Plan: tested on Dell Inspiron 13 7xxx series laptop with mentioned kwin change applied

Reviewers: romangg, davidedmundson

Reviewed By: romangg

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D27723